Steel piston ring has chromium ceramic anti-wear coating with micro-cracks around its peripheral edge, top and bottom faces of ring having nitride anti-wear coatings and forming sharp corners where they meet peripheral edge

摘要

The steel piston ring has a chromium ceramic anti-wear coating (7) with micro-cracks around its peripheral edge (2). The top (3) and bottom (4) faces of the ring have nitride anti-wear coatings (8, 9) and form sharp corners where they meet the peripheral edge.